Wide area networks for the Internet of Things (IoT) grow in number almost by the week. A score of systems are jostling to fill the vacuum that exists in the cellular world, at least for now. GSM may support the majority of the world’s wireless machine-to-machine connections, but its battery life is too short for some important emerging use cases, in which devices need to be able to be left untended for years. And LTE has to wait another year or more for commercial, standardized kit that meets the IoT’s requirements of extremely low power, cost and latency. Many technologies are filling the void, each of them hoping to build sufficient critical mass to survive the emergence of the LTE…